Ray Optics

Ratio of powers of a convex and concave lens is $\frac{3}{2}$ and their equivalent focal length (when lenses are kept in constant) is 30 cm . Focal lengths of lenses are

A light ray of wavelength 546 nm is incident on an air-glass interface. If the speed of light in air is $3 \times 10^8 \mathrm{~m} / \mathrm{s}$. Then, wavelength of light ray in glass will be
[Take, refractive index of glass, $\mu=1.5$ ]

The focal length of thin convex lens for red and blue rays are \(100 \mathrm{~cm}\) and \(98.01 \mathrm{~cm}\), respectively. There, the dispersive power of the material of the lens is

If an object of height \(6 \mathrm{~cm}\) is viewed through a liquid of refractive index \(\frac{4}{3}\) vertically at a depth of \(10 \mathrm{~cm}\). Then what will be its apparent height and apparent distance from the surface of liquid.

A plane glass mirror of thickness \(3 \mathrm{~cm}\) of material of \(\mu=\frac{3}{2}\) is silvered on the back surface. When a point object is placed \(9 \mathrm{~cm}\) from the front surface of the mirror, then the position of the brighte...

A person has a minimum distance of distinct vision as \(50 \mathrm{~cm}\). The power of lenses required to read a book at a distance of \(25 \mathrm{~cm}\) is

When an object is placed \(40 \mathrm{~cm}\) from a diverging lens, its virtual image is formed \(20 \mathrm{~cm}\) from the lens. The focal length and power of lens are

An object is \(8 \mathrm{~cm}\) high. It is desired to form a real image \(4 \mathrm{~cm}\) high at \(60 \mathrm{~cm}\) from the mirror. The type of mirror needed with the focal length is